Hi Marcus, We've just launched a basketball skills and drills resource library here on Weplay. You can find a bunch of drills in a variety of area for your fifth graders.
http://www.weplay.com/youth-basketball/drills Good luck!
The Miken drill is a great way to develop a good lay-up; and thats what 5th graders score with the most. It is simple, go from the left to right to left... making lay-ups and continue until you miss. Whoever makes the most can sit out for one sprint or some other reward.
Learn how to dribble the court, to properly do a lay up right and left, dribble with both hands, teach them to pass, learn to block out and defend your guy facing him (running backwards on the court) and how to make free throws. And the basic rules, 3 second lane violation, etc.
have them run up and down the gym dribbling the basketball, or do whats called figure 8 lay up drill where you make a number eight out of the 6 basketball goals i did those when i was in fifth grade i thought that they were pretty easy.